| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . + . | nat-basic | f | nat × nat → nat |
| . +1 | nat-basic | f | nat → nat |
| . -1 | nat-basic | pf | nat → nat with λ n. n ≠ 0 |
| . < . | nat-basic | p | nat × nat |
| a | choice | v | elem |
| aa | choice | c | elem |
| b | choice | v | elem |
| c | choice | v | elem |
| elem | elem | s | |
| elemf | choice | v | elem → elem |
| m | choice | v | nat |
| n | choice | v | nat |
| nat | nat-basic | s | |
| nf | choice | v | nat → elem |
| nfgen | choice | v | nat → nat → elem |
| ok | choice | p | elem |
| rel | choice | p | elem × elem |